Outlook.com bounces legitimate emails due to Microsoft rules
Original title: Outlook.com bounces legit emails as Microsoft's authentication crackdown goes sideways
Microsoft authentication changes cause Outlook.com to reject valid emails from domains lacking SPF or DMARC compliance.
Microsoft tightened email authentication requirements for domains sending over 5,000 emails per day, mandating DMARC, SPF, and DKIM compliance. This has led to widespread bouncing of legitimate emails on Outlook.com beginning at the end of last week. The issue affects small senders and is intermittent. Microsoft has classified it as a service degradation but has not issued an advisory explaining the changes.
Unconfirmed: Exact cause of the issue is under investigation by Microsoft
- Single line emails may now be rejected
- Rejection is intermittent
- No official Microsoft advisory issued
- Intermittent service degradation reported
Impact: legitimate emails from domains without SPF/DMARC
- 1.Ensure domains have proper SPF, DMARC, and DKIM records
- Vendors
- Microsoft
- Products
- Outlook.com
From the original article
2 min read at theregister.comMissing DMARC or wobbly SPF means your mail may be treated as suspicious
By Richard Speed · theregister.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.